Monroe-electronics Resistivity Meter - Surface - model 262A Manuel d'utilisateur télécharger pdf (Page 4)

POWER: Built-in rechargeable battery with 120VAC (230VAC optional)

adapter/charger supplied. For power line voltages other than 120

or 230 VAC a separate charging supply must be provided by the

customer. Power input requirements are 13VAC at 0.6A or 15VDC

at 0.5A. Center pin is negative. Connector OD is 5.0mm; ID is

2.5mm. Battery operation is 4-8 hours continuous use.

DIMENSIONS: 4" wide x 3 1/2" high x 5 3/4" long.

HOW MODEL 262A WORKS:

On the insulating base of the instrument are two metal rails that have slightly compressive

strips of conductive elastomeric material imbedded in them.

The size and position of these rails are such that when the unit is placed on the flat

surface of the material whose resistivity is to be tested, five "squares" of the material lie

between the contact lines in a parallel configuration.

When power is switched on a voltage is applied to one of the rails and the current flowing

between the rails is detected by the other one, thus defining the resistivity characteristics

of the material under test. Internal circuitry of the Model 262A-1 interprets this signal and

provides a direct readout of the surface resistivity of the material under test in ohms per

square. (Re. ASTM D257, para. 3.5)

In the resistance to ground mode, the test voltage is completely removed from the rail and

is applied to ground via a test lead supplied with the instrument. Current flowing between

ground and the sensing rail is detected and is converted to a direct readout of the

resistance of the intervening path in ohms.

CAUTION

DO NOT TOUCH RAILS WHILE UNIT IS IN OPERATION

When in operation, one of the rails is at a potential of 100 volts and is capable of delivering

an annoying shock to a person touching it.

Although current delivering capability is limited, a distinct hazard exists in the person's

reaction to the shock.

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Monroe-electronics Resistivity Meter - Surface - model 262A Manuel d'utilisateur Page 4